<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">
    <h2>{{counter}}</h2>
    <!--<button v-on:click="counter++">+</button>
    <button v-on:click="counter&#45;&#45;">-</button>-->
<!--    正常写法-->
    <!--<button v-on:click="increment">+</button>
    <button v-on:click="decrement">-</button>-->
<!--    语法糖-->
    <button @click="click()">+</button>
<!--    <button @click="{{decrement}}">-</button>-->
</div>

<script src="../../js/vue.js"></script>
<script>
    function click(){
        alert("456");
    }

    const app = new Vue({
        el: '#app',
        data: {
            counter: 0,

        },
        methods: {
            increment() {
                this.counter++
            },
            decrement() {
                this.counter--
            }
        }
    })
</script>

</body>
</html>